The recipe to create Potion of Prolonged Power now creates 10 potions (was 20).

Consider stocking up on these prior to release.

Four new neck enchants have been added.
Rank 1 recipes can be purchased from a vendor in the Farondis Hub.
Rank 2 recipes are found on creatures in specific Broken Isles zones (except Suramar), as long as you know the rank 1 recipe.
Rank 3 recipes are found in emissary chests for those zones, at a 20% chance.* The rank 3 recipe requires knowledge of the rank 1 or 2 recipe.

Okay, this is actually huge for enchanters. You should plan to get these recipes ASAP and get the jump on the competition. Get Farondis rep to exalted asap (no indication of rep requirement yet). Rank 2 might be a pain to find. If we somehow find the source of rank 2, it might be a good idea to queue up all emissary quests (except for nightfallen) and turn them in after rank 2.